What are the disadvantages of the iphone 3G with the card

iPhone has a lot of shortcomings, because the iPhone is sold in China is a cracked version, so there are many problems For example, you need to pay special attention to installing third-party software, because once you make a mistake, it will become a white apple, and you have to reflash the machine (that is, redo the system) It is recommended that you can go to the iPhone forum to see those good software Then the mobile phone is very uncomfortable to send text messages The keyboard is too small The fingers are too big, and they will often be wrong, and then Bluetooth can't transmit things There is also a built-in driver itune (also you pass the song, pass the ** software) is extremely inconvenient to use But this can be solved with unofficial upload software Most of the functions of the iPhone need to be connected to the Internet Mainly WiFi network (free) and Edge (GPRS Internet access, high Internet access fees, not recommended) The former is free but requires a wireless router In general, buying an iPhone needs to look at the disadvantages Which mobile phone has not many advantages The advantages are good to look at everywhere on the Internet You must be cautious when buying a machine Personally, I recommend going for Nokia's N95

Disadvantages of iPhone card sticker: unstable signal, inconvenient use, limited upgrade.

1. Unstable signal: For the card machine, the fatal defect is that Kaixun is due to the addition of patches on the SIM card, which will cause the signal to be unstable when playing ** and surfing the Internet, which is easy to affect the call quality and drop the line.

2. Inconvenient to use: the card machine is not convenient enough to use, the card machine must be perfectly activated with ICCID with the card to do it, if the ICCID is blocked, the replacement card will make the mobile phone unable to activate. And as long as the phone is turned off, you need to reset the card after restarting the phone every time.

3. Limited upgrade: There is also a lot of trouble in upgrading the card machine, which is due to the fact that on the one hand, Apple's function will add a new recognition mechanism to the system to check the card machine, and on the other hand, the card will also lose its effect because it is not compatible with the promotion of grandchildren. Therefore, the card machine cannot upgrade the system at will, and after each upgrade, you need to purchase a new card to reactivate it in order to use the call and network functions.

How to identify the iPhone card machine

1. Check the card slot. Take out the mobile phone card and card slot, see if there is a sticker, if possible, you can find a mobile phone flashlight from the card slot to observe whether there is a copper wire-like foreign object, if there is, you can determine that it is a built-in card.

2. System check. If the phone does not have a SIM card, check the mobile phone signal. If "No Service" is displayed, it means a built-in card machine.

You can also check it by the carrier in the settings, showing Carrier, Carrier Lab, Sprint, VF NL, Verizon, which are stuck phones.

3. Check the operator's service. Check what operator your card machine is, you can currently inquire in **, reply to the operator to get the query link, enter the serial number of your mobile phone, that is, Sun Qingke.